2020 Specialized Bicycles Sirrus Single Speed

	S	M	L	XL	XXL
Stack	564mm	592mm	610mm	638mm	670mm
Reach	388mm	400mm	402mm	414mm	426mm
Stack to Reach Ratio	1.45:1	1.48:1	1.52:1	1.54:1	1.57:1
Seat Tube Length, Unknown	430mm	470mm	510mm	550mm	580mm
Top Tube Length, Effective/Horizontal Center	555mm	575mm	583mm	603mm	631mm
Top Tube Slope	16.6deg	14.8deg	12.5deg	11deg	11deg
Head Tube Angle	70deg	71deg	71.5deg	72deg	72deg
Seat Tube Angle	73.5deg	73.5deg	73.5deg	73.5deg	73deg
Head Tube Length	133mm	159mm	176mm	203mm	236mm
Bottom Bracket Drop	70mm	70mm	70mm	70mm	70mm
Bottom Bracket Height	271mm	271mm	271mm	271mm	271mm
Chainstay Length	440mm	440mm	440mm	440mm	440mm
Chainstay Length Horizontal	434.4mm	434.4mm	434.4mm	434.4mm	434.4mm
Front-Center	626mm	638mm	640mm	656mm	678mm
Front-Center Horizontal	621.6mm	633.6mm	636.6mm	652.6mm	674.6mm
Wheelbase	1056mm	1068mm	1071mm	1087mm	1109mm
Fork Offset/Rake	51mm	51mm	51mm	51mm	51mm
Fork Length, Unknown	410mm	410mm	410mm	410mm	410mm
Trail	69.8mm high	63.5mm mid/neutral	60.3mm mid/neutral	57.2mm mid/neutral	57.2mm mid/neutral
Mechanical Trail	65.6mm	60mm	57.2mm	54.4mm	54.4mm
Wheel Flop	22.5mm	19.5mm	18.2mm	16.8mm	16.8mm
Standover Height	735mm	775mm	805mm	845mm	875mm
Tire to Pedal Spindle	115mm 170 mm cranks	127mm 170 mm cranks	129mm 170 mm cranks	140mm 175 mm cranks	162mm 175 mm cranks
Pedal Spindle to Ground Clearance	101mm 170 mm cranks	101mm 170 mm cranks	101mm 170 mm cranks	96mm 175 mm cranks	96mm 175 mm cranks

Very Upright

Somewhat Upright

Average

Somewhat Aggressive

Very Aggressive

The Bike Insights Upright/Aggressive scale is based on analysis of a bike’s proportions relative to similar sized bikes in the same category.

Category Trend

Source:https://www.specialized.com/us/en/sirrus-single-speed-mens-spec/p/173615?color=271962-173615&searchText=90919-7704

Geometry